Interdiffusion in the Ni–Mo system

Divya, V.D.; Balam, S.S.K.; Ramamurty, Upadrasta; Paul, Aloke

doi:10.1016/j.scriptamat.2010.01.008

Cited by 39 publications

(19 citation statements)

References 12 publications

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“…The average interdiffusion coefficient of the Mo 7 Ni 7 phase extracted using Wagner's method agrees well with the results from both the SauereFreise method and the forwardsimulation method when the composition dependency of interdiffusivity for this phase is small. The interdiffusion coefficients in the fcc Ni phase reported by Divya et al [28] are also given in Fig. 7(c), showing about four times higher values than our results.…”

Section: Niemosupporting

confidence: 70%

Extracting interdiffusion coefficients from binary diffusion couples using traditional methods and a forward-simulation method

Zhang

Zhao

2013

Intermetallics

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Section: Niemosupporting

confidence: 70%

Extracting interdiffusion coefficients from binary diffusion couples using traditional methods and a forward-simulation method

Zhang

Zhao

2013

Intermetallics

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“…In Ni-Mo and Co-Mo, very high hardness values of 11 and 16 GPa are obtained near the equiatomic composition. These compositions are identified as intermetallic phases from the discontinuity in the concentration-distance profiles (Figures S1(d) and (e)) as characterized in prior studies of Divya et al [10,21] We exclude these data points from our analysis as they do not represent solid-solutions. We also exclude data corresponding to Mo-rich end of the DCs as Mo shows limited solid solubility of less than 1 at.…”

Section: Resultsmentioning

confidence: 99%

“…In this context, the diffusion couple (DC) approach combined with smallscale testing methods such as nanoindentation and/or micropillar compression holds great promise. [6][7][8][9][10][11][12][13][14] By means of the DC method, a library of compositions is generated in the interdiffusion zones, and the compositional analysis along these zones is performed with a high degree of accuracy by employing techniques such as electron probe microanalysis (EPMA). The interdiffusion zones are then probed for hardness, H, by employing nanoindentation (NI), and H as a function of solute concentration, c, is obtained.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Solid-Solution Hardening in Several Binary Alloy Systems Using Diffusion Couples Combined with Nanoindentation

Kadambi

Divya

Ramamurty

2017

Metall Mater Trans A

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Analysis of solid-solution hardening (SSH) in alloys requires the synthesis of large composition libraries and the measurement of strength or hardness from these compositions. Conventional methods of synthesis and testing, however, are not efficient and high-throughput approaches have been developed in the past. In the present study, we use a high-throughput combinatorial approach to examine SSH at large concentrations in binary alloys of Fe-Ni, Fe-Co, Pt-Ni, Pt-Co, Ni-Co, Ni-Mo, and Co-Mo. The diffusion couple (DC) method is used to generate concentration (c) gradients and the nanoindentation (NI) technique to measure the hardness (H) along these gradients. The obtained H-c profiles are analyzed within the framework of the Labusch model of SSH, and the c 2=3 dependence of H predicted by the model is found to be generally applicable. The SSH behavior obtained using the combinatorial method is found to be largely consistent with that observed in the literature using conventional and DC-NI methods. This study evaluates SSH in Fe-, Ni-, Co-, and Pt-based binary alloys and confirms the applicability of the DC-NI approach for rapidly screening various solute elements for their SSH ability.

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“…The Kirkendall pores result from imbalanced diffusional fluxes, with a net outward flux of Ni and Cr atoms leaving vacancies in the Ni-Cr matrix, which coalesce into pores. [36][37][38] After homogenization at 1373 K (1100°C) for 48 hours, as shown in Figure 2(b), the central part of the wire is pore-free indicating pore sintering, while the outer wire region is characterized by the Kirkendall pores merging into larger, elongated pores which are connected at the wire surface. Mo content, as measured by EDS, is 4.5 ± 0.7 wt pct and near uniform throughout the entire cross-section.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale Cellular Structures at Phase Boundaries of Ni-Cr-Al-Ti and Ni-Cr-Mo-Al-Ti Superalloys

Dunand

2015

Metall Mater Trans A

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The microstructural evolution of Ni-20 pct Cr wires was studied during pack cementation where Al and Ti, with and without prior cementation with Mo, are deposited to the surface of the NiCr wires and subsequently homogenized in their volumes. Mo deposition promotes the formation of Kirkendall pores and subsequent co-deposition of Al and Ti creates a triple-layered diffusional coating on the wire surface. Subsequent homogenization drives the alloying element to distribute evenly in the wires which upon further heat treatment exhibit the c + c¢ superalloy structure. Unexpectedly, formation of cellular structures is observed at some of the boundaries between primary c¢ grains and c matrix grains. Based on additional features (i.e., ordered but not perfectly periodic structure, confinement at c + c¢ phase boundaries as a cellular film with 100 nm width, as well as lack of topologically close-packed phases), and considering that similar, but much larger, microstructures were reported in commercial superalloys, it is concluded that the present cellular structure solidified as a thin film, composed of eutectic c + c¢ and from which the c¢ phase was subsequently etched, which was created by incipient melting of a region near the phase boundary with high solute segregation.

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Interdiffusion in the Ni–Mo system

Cited by 39 publications

References 12 publications

Extracting interdiffusion coefficients from binary diffusion couples using traditional methods and a forward-simulation method

Extracting interdiffusion coefficients from binary diffusion couples using traditional methods and a forward-simulation method

Evaluation of Solid-Solution Hardening in Several Binary Alloy Systems Using Diffusion Couples Combined with Nanoindentation

Nanoscale Cellular Structures at Phase Boundaries of Ni-Cr-Al-Ti and Ni-Cr-Mo-Al-Ti Superalloys

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